MPPT Solar and Wind Power Boost Charge Controller

This circuit matches a low voltage solar or wind turbine input to a higher voltage battery. An analogue circuit will measure incoming current and voltage inputs to set the maximum power point tracking (MPPT) and boost the output voltage up to charge a higher, or equal voltage, battery. Input voltage range: 9v through 60v. Output battery voltages: 9v through 60v. MPPT will work only if the battery is higher than the input source. Otherwise, the circuit will act like a direct connection, source to output. It is based on the LTC3703 boost converter IC.

http://www.youtube.com/watch?v=Xw7ehax3330

http://www.youtube.com/watch?v=TX_G_rVwgFM

http://www.youtube.com/watch?v=xZDHSsTVJvM

http://www.youtube.com/watch?v=crSkmrQavXg

http://www.youtube.com/watch?v=HLdK_ghbQs4

http://www.youtube.com/watch?v=yejH6Rw2khM

http://www.youtube.com/watch?v=KjyXH7R807E

http://www.youtube.com/watch?v=upfmckiKWhI

I still have more testing to do. Later, I think I will sell my nine extra boards with one LTC3703 soldered in place, for $59.95US if you want to try the circuit. After they are gone, I might release the board layout diagram, which is critical to success.

It is 9v through 60v MPPT boost to a 48v nominal lead-acid battery. It needs more testing after I attach a wind turbine and a monitoring microcontroller. Otherwise, it seems to work, so far. How much power can it handle? I am not sure yet. I think 500 watts minimum and maybe 1K watts and with different mosfets and diodes and more copper over the traces, 4000 watts.

This circuit is an analogue computer, when run without a microprocessor. It is doing integration math, via the op amp. I added a jumper for optional microprocessor control. I have not tried it, yet.

http://www.opencircuits.com/images/9/97/Mppt_schematic_asof_Jul22_2012.png